Pfund series are produced in the spectrum of hydrogen atom__________________?
Correct answer: D. when electrons jump down to 5th- orbit
- A. when electrons jump down to 2nd- orbit
- B. when electrons jump down to 3rd- orbit
- C. when electrons jump down to 4th- orbit
- D. when electrons jump down to 5th- orbit
Explanation
The Pfund series consists of hydrogen-electron transitions that end at the fifth energy level, n = 5, with photons emitted in the infrared region. The Balmer series ends at n = 2 and the Paschen series at n = 3, so choosing either of those levels confuses the spectral series.
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About Spectrum of Hydrogen
The hydrogen spectrum consists of discrete emission lines produced when electrons fall between quantised energy levels and release photons. Questions use the Rydberg equation, photon energy and wavelength, and identify the Lyman, Balmer, Paschen, Brackett and Pfund series, which differ from continuous spectra.
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